[Aavso-photometry] Software for combining time series data taken with different filters to calculate transformed magnitudes

[Dirk Terrell]

On 9/5/2008 Lionel Catalan wrote:
> I think that I need a program (or perhaps an excel macro) that can
> interpolate instrumental magnitudes for each filter to common times 
> so that
> consistent values of b-v and v-i can be calculated.  I would 
> appreciate any
> suggestion.

I agree with Michael's comments about timescales. If the variable 
changes on timescales similar to your observing cadence, you'll get 
misleading results by interpolation. In the future, I would alter your 
observing sequence to be ivbbvi and then average the pairs in each 
filter. When you do that, you will have observation pairs for all 
filters centered on the same time. By putting the longer wavelength 
filters on the ends of the observing sequence, you minimize problems 
with varying extinction since the variation is slower at longer wavelengths.

Dirk